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A075349 a(1) = 1; first differences follow the pattern 1,2,2,3,3,3,4,4,4,4,5,5,5,5,5,..., i.e., the next n differences are n. 4
1, 2, 4, 6, 9, 12, 15, 19, 23, 27, 31, 36, 41, 46, 51, 56, 62, 68, 74, 80, 86, 92, 99, 106, 113, 120, 127, 134, 141, 149, 157, 165, 173, 181, 189, 197, 205, 214, 223, 232, 241, 250, 259, 268, 277, 286, 296, 306, 316, 326, 336, 346, 356, 366, 376, 386, 397, 408 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A060432(n-1) + 1. - David Wasserman, Jan 16 2005

MATHEMATICA

Accumulate[Join[{1}, Flatten[Table[Table[n, {n}], {n, 12}]]]] (* Harvey P. Dale, Aug 26 2013 *)

CROSSREFS

Sequence in context: A157795 A294060 A003066 * A156024 A234363 A194229

Adjacent sequences:  A075346 A075347 A075348 * A075350 A075351 A075352

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Sep 19 2002

EXTENSIONS

More terms from David Wasserman, Jan 16 2005

STATUS

approved

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Last modified July 25 13:05 EDT 2021. Contains 346290 sequences. (Running on oeis4.)